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. 2021 Feb 11;130(11):1228–1235. doi: 10.1177/0003489421995070

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© The Author(s) 2021

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Figure 2. — Mastoid opacification grades. Axial CT scan images demonstrate normally aerated, partially opacified left greater than right mastoid air cells and bilateral completely opacified mastoid air cells in images A, B, and C respectively.